Question 1

Earth receives approximately 1.7 $\times$ 1017 J of energy from the sun each second through a process called

Accepted Answer

A) conduction. 
B) convection. 
C) radiation. 
D) sublimation. 
E) evaporation. 
A) conduction. 
B) convection. 
C) radiation. 
D) sublimation. 
E) evaporation. C

Question 2

Modern railway tracks consist of continuous welded-steel rails of 1.0-km lengths.If the coefficient of linear expansion of steel is 11 $\times$ 10-6 K-1,by how much would such a rail change in length between the highest summer temperature (40ºC)and the lowest winter temperature (-40ºC)?

Accepted Answer

A) 44 cm 
B) 88 cm 
C) 0.88 mm 
D) 1.8 mm 
E) 4.4 cm 
A) 44 cm 
B) 88 cm 
C) 0.88 mm 
D) 1.8 mm 
E) 4.4 cm B

Question 3

Which of the following processes of heat transfer is independent of the area exposed?

Accepted Answer

A) conduction 
B) convection 
C) radiation 
D) All of these are independent of the area exposed. 
E) None of these is independent of the area exposed. 
A) conduction 
B) convection 
C) radiation 
D) All of these are independent of the area exposed. 
E) None of these is independent of the area exposed. E

Question 4

A common trick to open the lid of a jar that is stuck is to put the lid under hot running water.Suppose the diameter of the lid of a jar of strawberry jam is 6 cm,by how much does the circumference change if the temperature is increased by 30S1U1P1$\circ$S1S1P0C? Assume the lid is made of steel.

Accepted Answer

A) 2.0$\times$10 -3 cm 
B) 3.1$\times$10  -3 cm 
C) 4.1$\times$10 -3 cm 
D) 6.2$\times$10  -3 cm 
E) 5.2$\times$10  -3 cm 
A) 2.0$\times$10 -3 cm 
B) 3.1$\times$10  -3 cm 
C) 4.1$\times$10 -3 cm 
D) 6.2$\times$10  -3 cm 
E) 5.2$\times$10  -3 cm

Question 5

In operation an aluminum flywheel within an engine gearbox increases its temperature by 40S1U1P1$\circ$S1S1P0C.Assuming the flywheel to be a uniform circular disk,calculate the percentage change in the moment of inertia of the flywheel. (Coefficient of linear expansion for Al = 24 $\times$ 10-6/K.)

Accepted Answer

A) 0.002% 
B) 0.2% 
C) 0.1% 
D) 0.001% 
E) 1.0% 
A) 0.002% 
B) 0.2% 
C) 0.1% 
D) 0.001% 
E) 1.0%

Question 6

A glass rod that is 1.0 m long at 0ºC increases its length by 0.68 mm when heated to 80ºC.The coefficient of linear expansion of this glass is approximately

Accepted Answer

A) 8.5 $\times$ 10-6/Cº 
B) 6.8 $\times$ 10-4/Cº 
C) 0.013/Cº 
D) 1.0/Cº 
E) 80/Cº 
A) 8.5 $\times$ 10-6/Cº 
B) 6.8 $\times$ 10-4/Cº 
C) 0.013/Cº 
D) 1.0/Cº 
E) 80/Cº

Question 7

An object at temperature 227S1U1P1$\circ$S1S1P0C radiates energy at a net rate of R J/s. By what factor would the net rate of energy loss increase if the same object were at a temperature of 427S1U1P1$\circ$S1S1P0C? Assume the surrounding temperature is 0S1U1P1$\circ$S1S1P0C.

Accepted Answer

A) 4.1 
B) 3.8 
C) 12.5 
D) 8.3 
E) 6.7 
A) 4.1 
B) 3.8 
C) 12.5 
D) 8.3 
E) 6.7

Question 8

A certain blackbody radiates 100 W at a temperature of 2000 K.How much power would this body radiate at 3000 K?

Accepted Answer

A) 150 W 
B) 225 W 
C) 338 W 
D) 506 W 
E) 759 W 
A) 150 W 
B) 225 W 
C) 338 W 
D) 506 W 
E) 759 W

Question 9

The coefficient of linear expansion of the steel in a certain bridge is 1.10 $\times$10-5/Cº.If at a minimum winter temperature of -30ºC the bridge is 30.5 m long,at the summer maximum of 40ºC its length is increased about

Accepted Answer

A) 2.54 cm 
B) 2.54 mm 
C) 0.254 mm 
D) 25.4 µm 
E) 2.54 µm 
A) 2.54 cm 
B) 2.54 mm 
C) 0.254 mm 
D) 25.4 µm 
E) 2.54 µm

Question 10

The coefficient of linear expansion for most materials

Accepted Answer

A) is much less than 1 K-1. 
B) is much greater than 1 K-1. 
C) is approximately 1 K-1. 
D) can be less than,greater than,or about equal to 1 K-1. 
E) is described by none of these. 
A) is much less than 1 K-1. 
B) is much greater than 1 K-1. 
C) is approximately 1 K-1. 
D) can be less than,greater than,or about equal to 1 K-1. 
E) is described by none of these.

Question 11

The temperature gradient in a wall is 80º C/cm,and the thermal conductivity of this wall is 4.0 $\times$ 10-3 cal/s · cm · Cº.The amount of heat conducted per minute per square centimeter through this wall is approximately

Accepted Answer

A) 19 cal 
B) 27 cal 
C) 35 cal 
D) 42 cal 
E) 0.42 kcal 
A) 19 cal 
B) 27 cal 
C) 35 cal 
D) 42 cal 
E) 0.42 kcal

Question 12

If the thickness of a uniform wall is halved,the rate at which heat is conducted through the wall is

Accepted Answer

A) doubled. 
B) increased by a factor of four. 
C) decreased by a factor of four. 
D) cut in half. 
E) unchanged. 
A) doubled. 
B) increased by a factor of four. 
C) decreased by a factor of four. 
D) cut in half. 
E) unchanged.

Question 13

The length of an object varies with temperature according to   The coefficient of linear expansion of this object is

Accepted Answer

A) (-5 + 9T2)/L 
B) -5/L 
C) (-5 + 6T2)/L 
D) 9T2  
E) 9T2/L 
A) (-5 + 9T2)/L 
B) -5/L 
C) (-5 + 6T2)/L 
D) 9T2  
E) 9T2/L

Question 14

You have cut a hole in the middle of a large sheet of metal.When the sheet is heated,the area of the hole

Accepted Answer

A) does not change. 
B) always increases. 
C) always decreases. 
D) increases if the hole is not in the exact center of the sheet. 
E) decreases only if the hole is in the exact center of the sheet. 
A) does not change. 
B) always increases. 
C) always decreases. 
D) increases if the hole is not in the exact center of the sheet. 
E) decreases only if the hole is in the exact center of the sheet.

Question 15

The axes on a phase diagram are

Accepted Answer

A) temperature and volume. 
B) pressure and volume. 
C) isotherms and pressure. 
D) temperature and pressure. 
E) solid,liquid,and vapor. 
A) temperature and volume. 
B) pressure and volume. 
C) isotherms and pressure. 
D) temperature and pressure. 
E) solid,liquid,and vapor.

Question 16

The length of an object varies with temperature according to   The coefficient of linear expansion of this object is

Accepted Answer

A) 2 + 10T 
B) 2/L 
C) 10T/L 
D) T/L 
E) (2 + 10T)/L 
A) 2 + 10T 
B) 2/L 
C) 10T/L 
D) T/L 
E) (2 + 10T)/L

Question 17

If the absolute temperature of an object is tripled,the rate at which it radiates thermal energy

Accepted Answer

A) triples. 
B) increases by a factor of 9. 
C) increases by a factor of 27. 
D) increases by a factor of 81. 
E) depends on whether the absolute temperature is above or below zero. 
A) triples. 
B) increases by a factor of 9. 
C) increases by a factor of 27. 
D) increases by a factor of 81. 
E) depends on whether the absolute temperature is above or below zero.

Question 18

A scuba tank of volume 40 L is filled with 200 moles of compressed air at a pressure of 100 atm.What is the volume occupied by O2?

Accepted Answer

A) 6.37 L 
B) 1.34 L 
C) 0.67 L 
D) 5.03 L 
E) 2.68 L 
A) 6.37 L 
B) 1.34 L 
C) 0.67 L 
D) 5.03 L 
E) 2.68 L

Question 19

If $\alpha$ is the coefficient of linear expansion of a material at 0ºC,the volume thermal-expansion coefficient of this material at 0ºC is

Accepted Answer

A) ~$\alpha$ 
B) ~3$\alpha$ 
C) ~$\alpha$3 
D) ~$\alpha$1/3 
E) None of these is correct. 
A) ~$\alpha$ 
B) ~3$\alpha$ 
C) ~$\alpha$3 
D) ~$\alpha$1/3 
E) None of these is correct.

Question 20

The wall of a house consists of three layers: a wooden outer wall with an R factor of 1.0,a 3-in layer of fiberglass insulation with an R factor of 11,and a gypsum-board inner wall with an R factor of 0.33 (all R factors are in h · ft2 · Fº/Btu).When the temperature is 68ºF inside the house and - 4.0ºF outside,what is the rate of heat loss through an 8-ft by 15-ft section of this wall?

Accepted Answer

A) 700 Btu/h 
B) 780 Btu/h 
C) 5.8 Btu/h 
D) 130 Btu/h 
E) 350 Btu/h 
A) 700 Btu/h 
B) 780 Btu/h 
C) 5.8 Btu/h 
D) 130 Btu/h 
E) 350 Btu/h

Exam 20: Thermal Properties and Processes

Earth receives approximately 1.7 ×\times× 1017 J of energy from the sun each second through a process called

Modern railway tracks consist of continuous welded-steel rails of 1.0-km lengths.If the coefficient of linear expansion of steel is 11 ×\times× 10-6 K-1,by how much would such a rail change in length between the highest summer temperature (40ºC)and the lowest winter temperature (-40ºC)?

Which of the following processes of heat transfer is independent of the area exposed?

A common trick to open the lid of a jar that is stuck is to put the lid under hot running water.Suppose the diameter of the lid of a jar of strawberry jam is 6 cm,by how much does the circumference change if the temperature is increased by 30 ∘\circ∘ C? Assume the lid is made of steel.

In operation an aluminum flywheel within an engine gearbox increases its temperature by 40 ∘\circ∘ C.Assuming the flywheel to be a uniform circular disk,calculate the percentage change in the moment of inertia of the flywheel. (Coefficient of linear expansion for Al = 24 ×\times× 10-6/K.)

A glass rod that is 1.0 m long at 0ºC increases its length by 0.68 mm when heated to 80ºC.The coefficient of linear expansion of this glass is approximately

An object at temperature 227 ∘\circ∘ C radiates energy at a net rate of R J/s. By what factor would the net rate of energy loss increase if the same object were at a temperature of 427 ∘\circ∘ C? Assume the surrounding temperature is 0 ∘\circ∘ C.

A certain blackbody radiates 100 W at a temperature of 2000 K.How much power would this body radiate at 3000 K?

The coefficient of linear expansion of the steel in a certain bridge is 1.10 ×\times× 10-5/Cº.If at a minimum winter temperature of -30ºC the bridge is 30.5 m long,at the summer maximum of 40ºC its length is increased about

The coefficient of linear expansion for most materials

The temperature gradient in a wall is 80º C/cm,and the thermal conductivity of this wall is 4.0 ×\times× 10-3 cal/s · cm · Cº.The amount of heat conducted per minute per square centimeter through this wall is approximately

If the thickness of a uniform wall is halved,the rate at which heat is conducted through the wall is

The length of an object varies with temperature according to The coefficient of linear expansion of this object is

You have cut a hole in the middle of a large sheet of metal.When the sheet is heated,the area of the hole

The axes on a phase diagram are

The length of an object varies with temperature according to The coefficient of linear expansion of this object is

If the absolute temperature of an object is tripled,the rate at which it radiates thermal energy

A scuba tank of volume 40 L is filled with 200 moles of compressed air at a pressure of 100 atm.What is the volume occupied by O2?

If α\alphaα is the coefficient of linear expansion of a material at 0ºC,the volume thermal-expansion coefficient of this material at 0ºC is

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Earth receives approximately 1.7 $\times$ 10¹⁷ J of energy from the sun each second through a process called

Modern railway tracks consist of continuous welded-steel rails of 1.0-km lengths.If the coefficient of linear expansion of steel is 11 $\times$ 10^-6 K^-1,by how much would such a rail change in length between the highest summer temperature (40ºC)and the lowest winter temperature (-40ºC)?

A common trick to open the lid of a jar that is stuck is to put the lid under hot running water.Suppose the diameter of the lid of a jar of strawberry jam is 6 cm,by how much does the circumference change if the temperature is increased by 30^$\circ$C? Assume the lid is made of steel.

In operation an aluminum flywheel within an engine gearbox increases its temperature by 40^$\circ$C.Assuming the flywheel to be a uniform circular disk,calculate the percentage change in the moment of inertia of the flywheel. (Coefficient of linear expansion for Al = 24 $\times$ 10^-6/K.)

An object at temperature 227^$\circ$C radiates energy at a net rate of R J/s. By what factor would the net rate of energy loss increase if the same object were at a temperature of 427^$\circ$C? Assume the surrounding temperature is 0^$\circ$C.

The coefficient of linear expansion of the steel in a certain bridge is 1.10 $\times$ 10^-5/Cº.If at a minimum winter temperature of -30ºC the bridge is 30.5 m long,at the summer maximum of 40ºC its length is increased about

The temperature gradient in a wall is 80º C/cm,and the thermal conductivity of this wall is 4.0 $\times$ 10^-3 cal/s · cm · Cº.The amount of heat conducted per minute per square centimeter through this wall is approximately

A scuba tank of volume 40 L is filled with 200 moles of compressed air at a pressure of 100 atm.What is the volume occupied by O₂?

If $\alpha$ is the coefficient of linear expansion of a material at 0ºC,the volume thermal-expansion coefficient of this material at 0ºC is